Windshield wipers park in middle of windshield

This is a complex wiper system . Here are all the components involved !
The Wiper/Washer System consists of the following components:
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Windshield wiper/washer switch

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Body control module (BCM)

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Wiper 1 relay

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Wiper 2 relay

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Wiper diode

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Windshield wiper motor

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Windshield washer pump

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Windshield washer nozzles

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Windshield washer solvent container

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Windshield wiper arm and blade assemblies

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Windshield wiper transmission

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WIPER/SW 10A fuse

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WIPER 25A fuse

Circuit/System Description
The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer switch signal circuit is used to determine washer operation. The windshield wiper motor park operation is controlled by the BCM. The BCM recieves an input from the park switch to determine wiper blade position. When the wiper blades are at the bottom of the windshield glass in park position the wiper park switch will open and the circuit will be pulled up to B+ by the BCM. The park signal will be pulled to ground by the wiper motor park switch while the wiper blades are not in the park position.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low
Diagnostic Trouble Codes (DTCs)
The body control module (BCM) monitors the voltage on the windshield wiper switch signal 2 circuit for diagnostic purposes. If the circuit is shorted to voltage while the driver is commanded OFF, the BCM will store DTC B3715. If the circuit is shorted to ground while the driver is commanded ON, the BCM will store DTC B3715. Refer to DTC B3715.
It would be best to have a factory scan tool to diagnose this problem . it would make it easier anyway .
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If the wipers self-park in the other settings and after use of the screenwashers the fault is probably in the intermittent timer relay or circuitry.

If the self park is not working in the other settings the fault is probably the self-park switch within the wiper motor.

Sorry , no adjustment .
Wiper/Washer System Components
The Wiper / Washer System consists of the following components:
• Windshield wiper / washer switch
• Windshield wiper system module / motor
• Windshield washer fluid pump
• Windshield washer fluid level switch
• WPR 25A fuse
Wiper / Washer System Operation
The windshield wiper motor module is part of the windshield wiper motor cover and controls the wiper motor operation. The windshield wiper motor is a 2 speed motor. Windshield wiper DELAY operation is a low speed wiper motor function with a variable delay interval between the wipe cycles. The DELAY interval is controlled through a series of resistors within the wiper / washer switch.
Park Position Operation
When the windshield wiper / washer switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the wiper motor module will continue to operate the wiper motor until the wipers reach the park position. If the ignition is turned off while the wipers are in mid-cycle, the wipers will stop immediately where they are. The wipers will park the next time the ignition is cycled to the ON position.

Do you know how to do diagnostic's ?

Wipers Blades Do Not Park
Step
Action
Yes
No
Schematic Reference: Wiper/Washer Schematics
Connector End View Reference: Wiper/Washer Connector End Views
DEFINITION: This table diagnoses the wipers operate normally but will not return to the park position when the wiper operation is cancelled.
1
Did you perform the Diagnostic System Check - Vehicle?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
Turn ON the ignition, with the engine OFF.
Move the wiper switch to the LO position.
Move the wiper switch to the OFF position.
Do the front wipers advance to the park position?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Turn the ignition switch to the RUN position.
Turn the wiper switch to OFF.
Disconnect the wiper/washer switch connector.
Do the wipers park?
YES - Go to Step 7
NO - Go to Step 4
4
At the wiper/washer switch connector, measure the voltage of the windshield wiper switch signal 2 circuit.
Does the voltage measure greater than 1.0 volts?
YES - Go to Step 5
NO - Go to Step 8
5
Reconnect the wiper/washer switch connector.
Disconnect the wiper motor connector.
Measure the voltage of the windshield wiper switch signal 2 circuit.
Does the voltage measure greater than 1.0 volts?
YES - Go to Step 6
NO - Go to Step 8
6
Repair a short to battery positive voltage in the windshield wiper switch signal 2 circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
YES - Did you find and correct the condition?
NO - Go to Step 9
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7
Replace the wiper/washer switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column - Tilt.
YES - Did you complete the replacement?
NO - Go to Step 9
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8
Replace the wiper motor cover. Refer to Wiper Motor Cover Replacement .
YES - Did you complete the replacement?
NO - Go to Step 9
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9
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2

Remove the linkage from the wiper motor. Turn the wipers on then off. This will set the motor in the park position. Move the wipers by hand to there normal off position. Reinstall the linkage onto the wiper motor. The wipers should now park or stop in the correct position.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

There is a tab that bends and sometimes brakes. When you shut off the wipers the wiper motor reverses and is supposed to catch a tab to park the wipers. If the tab misses the catch they stop in the up position.

The intermittent function for the wipers has a variable resistor that controls the timing of the wipers in this mode. Replacement of the wiper switch will resolve this issue. Over time they do become worn, and do not make contact during the entire wiper cycle.

replace the wiper motor, the parking switch is either shorted or out of kilter

The wipers are parking in the middle because the timing mechanism is off. Once they start doing this it seems to continue to happen so the 1st suggestion is to replace the wiper motor. If U don't want to spend the $ right now it's a pretty easy fix to reset the timing. Park the wipers & remove the wiper arms. Then remove the plastic cowling that covers the wiper motor & the motor assembly. Turn the wiper assembly over without turning the motor. Remove the nut on the arm of the motor. Repostion the arm pointing away from the closet wiper directly inline with the short arm. reassemble.

Remove arm(s), put wiper motor in park,(shut off) then re-install arm at base of windshield where they were before,when shut off.(in park position.)

have you had any recent work done near the wipers? .if no the linkage from the wipers to the motor has come out of adjustment, there is a removeable cover above hood, and below winshield to see and repair as needed.. good luck marty